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我队鑽探地矿层,多是6～7级砂岩,含石英量多,易遇水受振而松散。因此鑽进中岩矿心採取率低。用普通单管鑽进沒有蕊柱;多次合用双重岩心管和外鉋槽鑽具,效果都差;后試用反循环鑽进,岩矿心採取率虽有提高,但由于操作和設备裝置的麻煩,尤其是在稍有漏水的鑽井,就根本不能应用。因此,岩矿心採取率极端低下的情况,一直不得解决。最近我们采用井底双管反循环鑽进的方法,經多次試用,效果很好,在同样的砂岩中,效率比用外鉋槽鑽具鑽进提高20～30％,而採取率却由原来的採不
My team drilled to the seam, mostly 6 to 7 sandstone, containing more quartz, easy to water and vibration by the loose. Therefore, mining rock core mining rate is low. Ordinary single-tube drilling without pillars column; multiple combined dual core tube and outer gouge drill, the effect is poor; after the trial reverse circulation drilling, rock mining although the heart rate taken to improve, but due to the operation and equipment installation The trouble, especially in the case of a slightly leaky drilling, can not be applied at all. Therefore, rock mining extreme low utilization rate, has not be resolved. Recently, we have adopted double-tube bottom hole reverse circulation drilling method, after many trials, the effect is very good, in the same sandstone, the efficiency than the use of external gouge drilling to improve drilling 20 to 30%, and the adoption rate from The original mining is not